Lifeboat davit



April 21, 1925.

S. E. ALLBIN LIFEBOAT DAVIT Filed Dec. 31, 1921 4 Sheets-Sheet l N nmxm/mvmn I Sim Emil Allbin.

ATTORNEYS WITNESSES W Ex n April 21, 1925. 1,534,049

S. E. ALLBIN LIFEBOAT DAVIT Filed De 31, 1921 4 Sheets-Sheet 2 WITNESSES\k/ Sim Emil Aubin.

By W

A TTOR/VEYS April 21, 1925.

1,534,049 s. E ALLBIN LIFEBOAT DAVIT Filed Dec. 31, 192 4 Sheets-Sheet 5WITNESSES mvmron ShnEmfl Allbin. L1, I QM/ QZ April 21-, 1925.

S. E. ALLBIN LIFEBOAT DAVIT 4 Sheets-Sheet 4 Filed Dec. 31, 1921INVENTOR Sim Emil Allbm.

' ATTORNEYS WITNESSES Wk of Seattle,

Patented Apr. 21, 1925.

UNITED STATES sm rnvrn. ALLBIN,

LIFEBO AT DAYIT.

I 1,534,049 PATENT OFFICE.

OF SEATTLE, WASHINGTON, ASSIGNOR TO MAYER LIFE BOAT C6.

1 INQ, OF SEATTLE, WASHINGTON.

Application filed December 31, 1921. Serial No. 526,146.

.To all whom it may coho-era:

Be it known that I, SIM EMIL AILLBIN, a citizen of the United States,and a resident in the county of King and State of Washington, haveinvented certain new and useful Improvements in Lifeboat Davits, ofwhich the following is a specification. This invention relates toimprovements in life boat davits.

The object of the invention is to provide clavits by which a life boatmay be swlmg a vessel,

and lowered from a vessel in an expeditious and reliable manner.

. It is also an object of the invention that the davits may be supportedor secured to the deck of a vessel in a substantial manner. It is afurther object of the invention that the davits be exceedingly simple inconstrue-- tion and breakage.

Other objects and objects relating to details of construction,combination and arrangement of parts will hereinafter appear inthe"'detailed description to follow.

parts thereof not subject to easy Theinvention is illustrated by way ofexample in the accompanying which Figure 1 is a view in elevationillustratdrawmgs, in

ing a pair of davits when in proper osition for lowering or raising lifeboats rom Figure 2 is an end elevation of the same and showing in dottedlines the position of the booms of a davit when operated for swinging alife boat from the deck of a vessel,

Figure 3 is a grouped view showing the end sections of a boom,

Figure 4 is a side elevation of a boom support or standard,

Figure 5 is a top plan view of the same, -Fig'ure 6 is an elevation ofthe same,

Figure 7 is a detailed perspectiveview of the actuating screw forlowering the davit booms,

Figure 8' is a sectional detail view show-.

taken substantially on the line 11-11 of Figure 10, V I

Figure 12 is a longitudinal sectional View of a collar associated withthe actuating screw shown in Figure 7, Figure 13 is a similar view of acollar carried byjeach of the ends of the hub shaft shown in Figure10,'aricl Figures 14 and 15 are a side elevation and end elevationrespectively of a gypsy associated with the booms. Referring [Othe'drawings more particm larly, A indicates generally a davit ope beingpositioned at each end of the phirality of boats E, and each'davitincluding-J a boom B which supports at its uper enda block and fall C.More particularly each davit A comprises a supporting frame or basegenerally indicated by the reference numeral 10, as-shown in detail inFigure 4, and consisting in acasting, the vertical portions 11 of whichare substantially parallel and the upper portion 12 inclined withrespect to'the base portion 13. The frame is formed with suitable rearand fori ward base plates 11 and 12 respectively, each of which areprovided with openings as at 13 through which screw bolts may beextended for securin the frame to the deck of a vessel. The base portion13 is formed with a bearing lug 15 through which the extremities of thefurcations 16 of the boom B are pivotally connected by the means of apin 17. The furcations 16 of the boom B straddle the upper portion 12 ofthe frame 10 and near their upper ends have journaled therebetween thestub shaft 17, Figure 8, said stub shaft extending through suitableopenings 18 formed in the furcations 16, and said openings bev ingpreferably lined as indicated at 19.

The stub shaft 17 has its intermediate portion formed with anenlargement 20 which terminates at each end in a flange 21 adapted toabut the bearing linings 19.

Also this enlarged portion 20 is formed collar 27 the operating screw isformed with an enlargement 28 which is adapted to fit within the centralopening 29 of the of the'openin 29 of the hub shaft 30 there is formed aco lar 33, and the ends 34 of the hub shaft 30 are journaled in theprojections 35 of the stand 10, said projections be ing each formed withsuitable and ali ned openings for journaling said ends 0 the hub shaftas indicated at 36. A collar such as shown in detail in Figure 13indicated by the reference numeral 37 is positioned upon each outer end34 of the hub shaft 30 and so held by the means of an insertion of a pinin the openings 38. As is obvious from this construction the screw 24may freely rotate and also free to swing in a vertical plane upon thehub shaft 30. The screw 24 is protected by the means ofa plate covering89, said plate covering having its ends secured as at 39 to the frame10.

Also theforward leg 11 of the frame 10 is formed with a lug 38' whichhas an inner inclined surface asshown in Figure 2, and is adapted toseat the boom B when lowered to its dotted line position as likewiseshown in Figure 2.

The upper end of each boom B is turned inwardly as at and terminates inan eye 41 with which the clevis 42 of the upper sheeve 43 of each blockand fall may be connected. The lower sheeve 44 of each block and fallalso carries the usual clevis as at 45 which is connected with a hook 46carried at each end of the boats E.

To each frame 10 there is secured a gypsy 48 which is shown in detail inFigures 14 and 15 and comprises a hollow cylindrical portion 49 havingformed upon each end a flange 50 and its end closed as at 5]., and saidclosed end formed with a pair of wings 52 which extend at right anglesthereto and are suitably braced by the plates 53. The wings 52 aresufficiently spaced so thatthc same may receive a vertical rib 54 of thestand 10 and so secured by the means of bolts indicated at 55, Figure l.Also'a vertical rib 56 of the rear leg ll of the stand 10 is formed withan eye or opening 57 through which there isextended a bar 58, Figures 1and 4. The free end 59 of the rope or cable forming each block and fallC may be held by windin the same about its associated gypsy 48 a cwturns and further securing the same to the bar 58, shown in Figure 1.

In the operation of the present apparatus when it is dcsirodto lower aboat the blot-h and falls are first oprralcd for raising the uppermostlJOut with "which tlu-y are conward! position shown in Figure 2. At thistime nected, s6 the game clear the boat therebeneath and 'then -thecrank 26 operated for moving tli booms' B outuntil they assume thedotted line each boom will rest upon its'seat 38 and will so bold andsupport the boatin, a rigid andpositive manner. The block and fall 0 maynow be further operated for lowering the boat into the water. When it isdesired to raise the boat then the blockand falls are again operated toraise the boat from the. water to the position shown -in dotted lines inFigure 2, and the crank 26 is then turned for'raising the booms B totheir. original position. Dur ngthis operation the free ends 59 of theropes forming the block and falls are of course.

made secure by the means of the gypsies 48 and the bars 58. It is ofcourse to be obsegved that the gypsies 48 are utilized in the usualmanner for letting out the block and falls and taking the same up duringthe lowering and raising'of the boat suspended thereby.

While'I have shown and described the preferredv form of my invention Iwish it to be understood that I am aware of the fact that theconstruction, combination and arrangement of parts may be changed bythose skilled in the art without departing from the spirit of theinvention, as indicated bythe appended claims.

- I claim:

1. In a device of the character descr bed, a boomhaving its one endprovided with a pair of elongated prongs, a support, a p1v otalconnection between said support and the free ends of said prongs adaptedto permit vertical swinging movement of said boom, a stub shaftrotatably supported between said prongs adjacent the inner ends thereof,a worm shaft, said stub shaft carrying a nut, the stub shaft having a.threaded passage to receive the worm shaft and being flattened onopposite sides at right an Ice to the axis of the worm shaft and havingcylindrical ends of a larger cross section than; the central portionthereof whereby said stub shaft may be placed in positionprongsstraddling the upper end portion of said frame, a pivot connectionbetween the lower end portion of said frame and the free ends of saidprongs, a.nut rotatably supported between said prongs adjacent the innerends thereof, a screw supported by said frame at a point abovethe ivotalsupport of said boom, said nut being adapted to receive said screw andthereby permit swinging movement of the boom in either direction withthe corresponding operation of said screw, a stub shaft, the upper sur-'end of the frame for the boom, the incline of the upper surface of theframe being such as to permit swinging of the screw.

i 3. In a device of the character described, a frame substantiallysquare in formation and having an inclined upperside, a boom terminatingat its one end in a pair of elongated prongs, said prongs straddling theupper portion of said frame, a pivot connection between the lower ortionof the frame .and the free ends 0 said prongs whereby to permit the boomto swing in a vertical plane, a screw rotatably supported at theuppermost end of the top portion of the frame, said screw being adaptedto swing in a plane corresponding to the boom, and a rod rotatablysupported between the prongs of the boom adjacent the inner ends thereofadapted to receive said screw, a stub shaft, the upper surface of theframe being inclined and adapted to receive the rotatingstub shaftsupporting the screw, the lower end of the frame being provided with arecess for said boom, the incline of the upper surface being such as topermit swinging of the screw.

4. In a device of the character described, a frame substantially squarein formation and Having an inclined upper side, a boom terminating atits one end in a pair of elongated prongs, said prongs straddling theupper portion of said frame, a pivot connection between the lowerportion of the frame and the free ends of said prongs whereby to permitthe boom to swing in a vertical plane, a screw rotatably supported atthe uppermost end of the top portion of the frame, said screw beingadapted to swing in a plane corresponding to the boom, a rod rotatablysupported between the prongs of the boom adjacent the inner endsthereof, and a wrist positioned at the lowermost end of the upperportion of said frame whereby said boom may be su ported when swung toengage said wrist, t e upper surface of the frame being inclined andadapted to receive the rotating stub shaft, the incline of the uppersurface of the frame being such as to permit swinging of the screw.

SIM EMIL ALLBIN.

